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8346133: Refactor java.time.ZoneOffset caching

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Reviewed-by: jlu, liach, rriggs
This commit is contained in:
Naoto Sato 2026-03-24 21:35:17 +00:00
parent 18fdbd2404
commit 4b38e7bcd3
1 changed files with 10 additions and 9 deletions
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19
src/java.base/share/classes/java/time/ZoneOffset.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2012, 2025, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2012, 2026, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2025, Alibaba Group Holding Limited. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
@ -87,9 +87,9 @@ import java.util.Objects;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;
import java.util.concurrent.atomic.AtomicReferenceArray;
import java.util.function.Supplier;
import jdk.internal.util.DecimalDigits;
import jdk.internal.vm.annotation.Stable;
/**
* A time-zone offset from Greenwich/UTC, such as {@code +02:00}.
@ -178,8 +178,13 @@ public final class ZoneOffset
/**
* The zone rules for an offset will always return this offset. Cache it for efficiency.
*/
@Stable
private transient ZoneRules rules;
private final transient LazyConstant<ZoneRules> rules =
LazyConstant.of(new Supplier<ZoneRules>() {
@Override
public ZoneRules get() {
return ZoneRules.of(ZoneOffset.this);
}
});
//-----------------------------------------------------------------------
/**
@ -521,11 +526,7 @@ public final class ZoneOffset
*/
@Override
public ZoneRules getRules() {
ZoneRules rules = this.rules;
if (rules == null) {
rules = this.rules = ZoneRules.of(this);
}
return rules;
return rules.get();
}
@Override